Still trying to push the limits with a limited number of steep hills available. With a steep enough hill and enough distance I guess gravity would do most of the work. Without that I've been trying to give gravity a helping hand by gearing up.
Swapped out the 42T cog on the Giant for a 50T and got my top speed up to 68kph before spinning out | running out of road.
Swapped out the 44T cog on the CF prototype out for a 62T cog and came close to three digits but couldn"t quite push it over the top. Maybe another day.